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    Friction Force, Contact Resistance, and Lubricant Shear Behavior at the Magnetic Head-Disk Interface During Starting

    Source: Journal of Tribology:;1997:;volume( 119 ):;issue: 004::page 830
    Author:
    S. Wang
    ,
    K. Komvopoulos
    DOI: 10.1115/1.2833893
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: During the starting operation of magnetic rigid disks, a stiction phenomenon characterized by a high friction force may be encountered due to the smoothness of the contacting surfaces and the small thickness of the lubricant film. Since friction measurement using a force transducer yields a signal proportional to the slider displacement, the real friction force at the head-disk interface cannot be measured directly. In the present study, a dynamic data analysis scheme is developed to obtain the real friction force as a function of time based on the measured apparent friction force. Electric contact resistance measurements demonstrate that the transition from static to kinetic friction occurs before the apparent friction force reaches a maximum value. Assuming a constant acceleration of the disk, the relative slip velocity at the contact interface is obtained as a function of time. The relationship between the shear stress and shear strain rate for a relatively thick lubricant film is found to be approximately linear up to a critical value of the shear stress. Due to the extremely high shear strain rates, the maximum real friction force can be significantly greater than the maximum static friction force.
    keyword(s): Force , Friction , Lubricants , Shear (Mechanics) , Disks , Contact resistance , Stiction , Stress , Measurement , Displacement , Signals , Transducers AND Thickness ,
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      Friction Force, Contact Resistance, and Lubricant Shear Behavior at the Magnetic Head-Disk Interface During Starting

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/119411
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    • Journal of Tribology

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    contributor authorS. Wang
    contributor authorK. Komvopoulos
    date accessioned2017-05-08T23:54:44Z
    date available2017-05-08T23:54:44Z
    date copyrightOctober, 1997
    date issued1997
    identifier issn0742-4787
    identifier otherJOTRE9-28672#830_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/119411
    description abstractDuring the starting operation of magnetic rigid disks, a stiction phenomenon characterized by a high friction force may be encountered due to the smoothness of the contacting surfaces and the small thickness of the lubricant film. Since friction measurement using a force transducer yields a signal proportional to the slider displacement, the real friction force at the head-disk interface cannot be measured directly. In the present study, a dynamic data analysis scheme is developed to obtain the real friction force as a function of time based on the measured apparent friction force. Electric contact resistance measurements demonstrate that the transition from static to kinetic friction occurs before the apparent friction force reaches a maximum value. Assuming a constant acceleration of the disk, the relative slip velocity at the contact interface is obtained as a function of time. The relationship between the shear stress and shear strain rate for a relatively thick lubricant film is found to be approximately linear up to a critical value of the shear stress. Due to the extremely high shear strain rates, the maximum real friction force can be significantly greater than the maximum static friction force.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFriction Force, Contact Resistance, and Lubricant Shear Behavior at the Magnetic Head-Disk Interface During Starting
    typeJournal Paper
    journal volume119
    journal issue4
    journal titleJournal of Tribology
    identifier doi10.1115/1.2833893
    journal fristpage830
    journal lastpage839
    identifier eissn1528-8897
    keywordsForce
    keywordsFriction
    keywordsLubricants
    keywordsShear (Mechanics)
    keywordsDisks
    keywordsContact resistance
    keywordsStiction
    keywordsStress
    keywordsMeasurement
    keywordsDisplacement
    keywordsSignals
    keywordsTransducers AND Thickness
    treeJournal of Tribology:;1997:;volume( 119 ):;issue: 004
    contenttypeFulltext
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